Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators

Chung, Sunjae, Eklund, Anders, Iacocca, Ezio, Mohseni, Seyed Majid, Sani, Sohrab R., Bookman, Lake, Hoefer, Mark A., Dumas, Randy K. and Åkerman, Johan (2016) Magnetic droplet nucleation boundary in orthogonal spin-torque nano-oscillators. Nature Communications, 7 (1). p. 11209. ISSN 2041-1723

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Official URL: https://doi.org/10.1038/ncomms11209

Abstract

Static and dynamic magnetic solitons play a critical role in applied nanomagnetism. Magnetic droplets, a type of non-topological dissipative soliton, can be nucleated and sustained in nanocontact spin-torque oscillators with perpendicular magnetic anisotropy free layers. Here, we perform a detailed experimental determination of the full droplet nucleation boundary in the current–field plane for a wide range of nanocontact sizes and demonstrate its excellent agreement with an analytical expression originating from a stability analysis. Our results reconcile recent contradicting reports of the field dependence of the droplet nucleation. Furthermore, our analytical model both highlights the relation between the fixed layer material and the droplet nucleation current magnitude, and provides an accurate method to experimentally determine the spin transfer torque asymmetry of each device.

Item Type: Article
Subjects: F200 Materials Science
F300 Physics
G100 Mathematics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Elena Carlaw
Date Deposited: 23 Sep 2019 15:55
Last Modified: 11 Oct 2019 13:18
URI: http://nrl.northumbria.ac.uk/id/eprint/40822

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